first go at a filename santitizer that supports non ascii chars

sanitizeFilename.js

function sanitizeFilename (filename){
	var blacklist = /[^\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF0-9a-z'\s\-_]/gi;
	return filename.replace(blacklist, '').trim().substring(0, 200); // 200 should be more than enough, but still safe
}